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Spray-deposited Co-Pi Catalyzed BiVO4: a low-cost route towards highly efficient photoanodes

Published online by Cambridge University Press:  28 May 2012

Fatwa F. Abdi ,
Nienke Firet ,
Ali Dabirian  and
Roel van de Krol
Fatwa F. Abdi
Affiliation:
Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
Nienke Firet
Affiliation:
Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
Ali Dabirian
Affiliation:
Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
Roel van de Krol
Affiliation:
Materials for Energy Conversion and Storage (MECS), Department of Chemical Engineering, Delft University of Technology, P.O. Box 5045, 2600 GA Delft, The Netherlands
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Abstract

Bismuth vanadate (BiVO4) thin films are deposited by a low-cost and scalable spray pyrolysis method. Its performance under AM1.5 illumination is mainly limited by slow water oxidation kinetics. We confirm that cobalt phosphate (Co-Pi) is an efficient water oxidation catalyst for BiVO4. The optimum thickness of BiVO4 is 300 nm, resulting in an AM1.5 photocurrent of 1.9 mA/cm2 at 1.23 V vs. RHE when catalyzed with Co-Pi. Once the water oxidation limitation is removed, the performance is limited by low charge separation efficiency. This causes more than 60% of the electron-hole pairs to recombine before reaching the respective interfaces. The slow electron transport is shown to be the main cause of this low efficiency, and future efforts should therefore be focused on addressing this key limitation.

Keywords

spray pyrolysisenergy generationphotochemical
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1446: Symposium U – Materials for Catalysis in Energy , 2012 , mrss12-1446-u02-05
Copyright
Copyright © Materials Research Society 2012

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References

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